Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

Over the years I have bought good and bad spark plugs. I once bought the Bosch 4+, the ones with the four prongs and they were great on fuel eceonomy but sucked in power. I have used the Split Fires for many years and have gotten good results but I still have that nagging question about the best sparks to use.

Also, I have heard from different mechanics as to which sparks to use and get varying answers. So, I will ask the question here and see what happens:

What are the best/recommeded spark plugs for a 92 Camaro RS (305 TBI)? Hopefully, I can put this question to rest. Thx for any info in this!

Usually when you ask for an opinion on the best spark plugs, you'll get a hundred different replies. My personal one is I've never had decent results with any of the Bosch platinum style plugs. I experienced the same result as you, lack of power. They seem to work good in 4 cylinders, but tons of people complain about them when they run em in a V8. Sh*tfires are just overpriced gimmickry. I had the same motor as you, 305 TBI. I ran the AC plugs in it for a while, and they worked fairly decent. However, I did notice a slight improvement when I switched to Champion RV17YC's. Car had a little better pickup and power with them. Keep in mind those are just the standard, run-of-the-mill Champion plugs(Copper Plus), no exotic metals, multiple tips, etc. I don't know how well they work in the TPI motors, but they sure kept my lowly TBI happy! I changed them about every 45K or so. If you want plugs that'll go 100K without problems, go with the AC Delco Rapidfires. They're a bit spendy though.

used 8 different kinds and best one was accel U-Groove blister pack best ones i ever bought made a .25 difference on time records compared to my second best times using V power spark plugs trust me worth every pennie

I've got Champion RV19YC's in mine! I have heard that my 85 Z28(305, 4bbl) is supposed to be running RV17YC's. I'm a bit worried that the heat range is wrong with these plugs(RV19YC's). Anyone else used the 19's over the 17's?

my car burns a lot of oil and the block learn is sitting at 158. injector pulse width is 2.48ms but it misfires, lack of power stumble popping at 4200 rpms. i am running champion plugs now gapped .35. so my question is how can i benefit from running different plugs. would a different heat range or better plug withstand oil fouling and what not. also what heat range.

Use ac delco. Bosch and shitfires are for 4 cylinder hi-revving rpm engines. Chevys use ac delco parts for a reason and if your car runs good (not burning oil or coolant) you'll easily get 100,000 miles out of them

Ok guys here's my question as far as fuel economy? Im only looking into Ac Delco's or NGK. Which one gives better mpg? It might not be such a big difference but I know NGK is strictly for Japanese cars. Which those rice rockets are known for their good mpg's (no offense hehe AMERICAN MUSCLE...U.S.A.)

Ok guys here's my question as far as fuel economy? Im only looking into Ac Delco's or NGK. Which one gives better mpg? It might not be such a big difference but I know NGK is strictly for Japanese cars. Which those rice rockets are known for their good mpg's (no offense hehe AMERICAN MUSCLE...U.S.A.��)

Ok guys here's my question as far as fuel economy? Im only looking into Ac Delco's or NGK. Which one gives better mpg? It might not be such a big difference but I know NGK is strictly for Japanese cars. Which those rice rockets are known for their good mpg's (no offense hehe AMERICAN MUSCLE...U.S.A.��)

No difference in mpg. Stop listening to/reading anyone/anything that tells you any different.
Use the correct plug for the application, correct reach, correct heat range, and there is no difference in performance or mileage between those two or any other quality plug.
Just make your choice based on availiablity/price.